[#493] config: Add example config files of storage node application

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

config/example/README.md

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+# Examples of correct configuration file structures 
+
+Here are files in all supported formats and with all possible configuration values
+of NeoFS applications.
+
+All parameters are correct, however, they are for informational purposes only. 
+It is not recommended to transfer these configs for real application launches.
+
+## Config files
+
+- Storage node
+  - JSON: `node.json`
+  - YAML: `node.yaml`

config/example/node.json

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+{
+  "logger": {
+    "level": "debug"
+  }
+}

config/example/node.yaml

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+logger:
+  level: debug